Please stop avast from making folders with new names as %dir%\avast\setup\New_<<new part>>\instup.exe . It requires to – allow the new location, with each update . If multiple folders is needed, just define the minimal amount of names required and reuse the same paths after previous files was deleted .
Hi, you could try the new Icarus installer: https://forum.avast.com/index.php?topic=264883.0